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<html >
<head>
    <meta charset="utf-8" />
    <title></title>
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        p
        {
            font-family: 微软雅黑;
            font-size: 14px;
            font-weight: bold;
            color: red;
        }
        #p2
        {
            color :blue;
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    </style>
</head>
<body>
    <P id="P1">HTNL控制网页的结构</p >
    <P id="p2">CSS控制网页的外观</p >
    <P id="p3">Javascript控制网页的行为</p >
</body>
</html>